UTXvRNT – Tap-Changer Transformer Voltage Regulator

UTXvRNT is digital step-up/down voltage regulator for transformers with on-load tap changer. It is designed for all systems of high and medium voltage lines and working with grounded, isolated or compensated common point.

UTXvRNT provides fast and reliable adjustment. Additional features include compensation of voltage decreases, independent: daily, calendar, holiday and weekend voltage settings, integrated recorder functions for event, distortion and voltage quality registration to ensure the implementation of even the most sophisticated applications. UTXvRNT is eqipped with different communication interfaces – available are: RS-232, RS-485 according to the IEC 870-5-103 standard, optical fiber and/or TCP/IP.

UTXvRNT is available in two versions:

  • UTXvRNT2 – for two winding section transformers
  • UTXvRNT3 – for three winding section transformers

UTXvRNT features:

  • multiprocessor measurement and decision-making system
  • information fully digital processing
  • it works with two or three winding transformers
  • it works in automatic and manual mode
  • clock with automatic summer – winter time changes
  • enhanced features of programmable logic functions
  • four main regulation modes:
    • U1 measure mode
    • U2 measure mode
    • average U1 and U2 mode
    • maximum U1 and U2 mode
  • adjustable voltage levels (three daily, one weekend and ten holiday) can be specified
  • whole year-round calendar with free choice of dates and support for public holidays
  • three banks of settings with possibility of active bank automatic selection
  • galvanic separation of all analog and digital inputs and outputs
  • XR and Z type compensation independently adjustable for different measuring circuits
  • adjustable overcurrent protection of motor switch
  • power quality monitoring system
  • tap-changer remote control
  • work processes reporting by using event and distortion recorders
  • local graphic display
  • programmable 16 LED indicator and 8 pole keyboard
  • simultaneous operation with IEC 870-5-103 protocol and CC-Bus
  • switch action and work time counters
  • internal systems permanent supervision
  • three levels of password-protected rights
  • visualization, control and configuration by the SAZ 2000 software
  • overcurrent, over- and undervoltage locking